/*
 *
 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 * 
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
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 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
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 * 
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
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 * 
 */

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

import database.*;
import cart.*;
import util.Currency;
import exception.*;

/**
 * This is a simple example of an HTTP Servlet.  It responds to the GET
 * method of the HTTP protocol.
 */
public class CatalogServlet extends HttpServlet { 
   private BookDB bookDB;

   public void init() throws ServletException {
      bookDB =
            (BookDB)getServletContext().getAttribute("bookDB");
         if (bookDB == null)
             throw new UnavailableException("Couldn't get database.");
   }

   public void destroy() {
         bookDB.remove();
         bookDB = null;
   }
     
     public void doGet (HttpServletRequest request,
                       HttpServletResponse response)
                        throws ServletException, IOException {

        // Get the user's session and shopping cart
   HttpSession session = request.getSession(true);
   ResourceBundle messages = (ResourceBundle)session.getAttribute("messages");

   ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");

        // If the user has no cart, create a new one
        if (cart == null) {
            cart = new ShoppingCart();
            session.setAttribute("cart", cart);
        }

   // set content-type header before accessing the Writer
        response.setContentType("text/html");
            response.setBufferSize(8192);
            PrintWriter out = response.getWriter();

   // then write the data of the response
        out.println("<html>" +
                    "<head><title>" + messages.getString("TitleBookCatalog") + "</title></head>");

        // Get the dispatcher; it gets the banner to the user
        RequestDispatcher dispatcher =
               getServletContext().getRequestDispatcher("/banner");
                                       
        if (dispatcher != null)
               dispatcher.include(request, response);
               

        //Information on the books is from the database through its front end

        // Additions to the shopping cart
        String bookId = request.getParameter("bookId");
        if (bookId != null) {

            try {
               
               BookDetails book = bookDB.getBookDetails(bookId);

               cart.add(bookId, book);
               out.println("<p><h3>" + "<font color=\"#ff0000\">" + messages.getString("CartAdded1") + 
               						"<i>" + book.getTitle() + "</i> " + 
                          messages.getString("CartAdded2") + "</font></h3>");
           } catch (BookNotFoundException ex) {
                  response.reset();
                  throw new ServletException(ex);
           }
        }

        //Give the option of checking cart or checking out if cart not empty
         if (cart.getNumberOfItems() > 0) {
            out.println("<p><strong><a href=\"" +
                        response.encodeURL(request.getContextPath() + "/showcart") +
                        "\">" + messages.getString("CartCheck") + "</a>&nbsp;&nbsp;&nbsp;" +
                        "<a href=\"" +
                        response.encodeURL(request.getContextPath() + "/cashier") +
                        "\">" + messages.getString("Buy") + "</a>" +
                        "</p></strong>");
        }

        // Always prompt the user to buy more -- get and show the catalog
        out.println("<br> &nbsp;" +
                    "<h3>" + messages.getString("Choose") + "</h3>" +
                    "<center> <table>");

          
         try {
               Collection coll = bookDB.getBooks();

               Iterator i = coll.iterator();
               Currency c = (Currency)session.getAttribute("currency");
               if (c == null) {
                  c = new Currency();
                  c.setLocale(request.getLocale());
                  session.setAttribute("currency", c);
               }
               while (i.hasNext()) {
                     BookDetails book = (BookDetails)i.next();
                     bookId = book.getBookId();
                     c.setAmount(book.getPrice());
      
               //Print out info on each book in its own two rows
               out.println("<tr>" +

                           "<td bgcolor=\"#ffffaa\">" +
                           "<a href=\"" +
                           response.encodeURL(request.getContextPath() + "/bookdetails?bookId=" + bookId) +
                           "\"> <strong>" + book.getTitle() +
                           "&nbsp; </strong></a></td>" +

                           "<td bgcolor=\"#ffffaa\" rowspan=2>" +
                           c.getFormat() +
                           "&nbsp; </td>" +

                           "<td bgcolor=\"#ffffaa\" rowspan=2>" +
                           "<a href=\"" +
                           response.encodeURL(request.getContextPath() + "/catalog?bookId=" + bookId)
                           + "\"> &nbsp;" + messages.getString("CartAdd") + "&nbsp;</a></td></tr>" +

                           "<tr>" +
                           "<td bgcolor=\"#ffffff\">" +
                           "&nbsp; &nbsp;" + messages.getString("By") + "<em> " + book.getFirstName() +
                           " " + book.getSurname() + "</em></td></tr>");
               }

            } catch (BooksNotFoundException ex) {
                     response.reset();
               throw new ServletException(ex);
            }

   
        out.println("</table></center></body></html>");
        out.close();
    }

    public String getServletInfo() {
        return "The Catalog servlet adds books to the user's " +
               "shopping cart and prints the catalog.";

    }
}
